Compressor



Jan. 9, 1934. w. K. SCHMIDT COMPRES SOR Filed Oct. 24, 1931 2Sheets-Sheet l wmmm@ d /n vento/.-

Jan. 9, 1934. w. K. SCHMIDT 1,943,091

COMPRESSOR Filed Oct. 24, 1931 2 Sheets-Sheet 2 Patented Jan. 9, 1934UNITED STATES PATENT OFFIC Application October 24, 1931, Serial No.570,897, and in Germany October 28, 1930 1 Claim.

My invention relates to compressors for refrigerators, particularly ofthe kind operating with a volatile refrigerant, for instance ethylchloride.

It is an object of my invention to provide a compressor which canreadily be taken to pieces and the parts of which are not interconnectedby screws or the like so that the compressor is particularly suitablefor use in cases where the personnel handling it is unskilled asis thecase for instance in confectioneries manufacturing icecream, coldbeverages etc. Obviously in all such cases the attendant must be enabledto dismantle the compressor for cleaning and to reassemble the partscorrectly Without the least possible chances of failure. This can bedone only if all the parts of which the compressor is composed, and themeans for fixing them in place are extremely simple in construction andsimply handled.

In the drawings aflixed to this specification and forming part thereofan embodiment of my invention is illustrated diagrammatically by way ofexample.

In the drawings Fig. 1 is a front elevation, partly in vertical sectionand with some parts broken away, of a refrigerator comprising acompressor, a pipe coil, a fan and an electromotor, the evaporator beingomitted,

Fig. 2 is a plan view, partly in horizontal section, of the apparatusshown in Fig. 1,

Fig. 3 is a front elevation and Fig. 4 is a side elevation of thecompressor,

' partly in vertical section, drawn to a larger scale.

Referring now to the drawings, A is the foundation plate on which thecompressor B, the fan C and the electromotor D are mounted. Theevaporator (not shown) is arranged below the plate A. The compressorcomprises a cylinder 2, a cup-shaped cylinder cover 3 and a piston 1designed in the usual manner. The cylinder is here formed as a plaincylindrical tube free from projections, perforations etc. and thereforeeasy to clean. Similarly the cylinder cover has the form of asubstantially plain hemispherical cup fitting the top edge of thecylinder, while the bottom edge of the cylinder fits in a circulargroove 2' of the base 7. 4 is a strap having projections 4 formed on thelower ends of its legs engaging corresponding recesses in the compressorbase 7. 5 is a screw bolt passing through the curved portion of thestrap 4 and through a curved plate 6, the free end of the bolt 5 restingon the cylinder cover 3 and holding same down on the top edge of thecylinder 2, at the same time forcing the bottom edge of the cylinder 2into a groove 2 in the compressor base 7. The cover 3 and the cylinder 2can thus be readily removed by unscrewing the bolt 5, the cover 3,cylinder 2 and base 7 being fitted together without screwing.

The refrigerant ows from the evaporator (not shown) through the bentpipe 8 (Figs. 1 and 4) into the crank case 9, through the suction valve10 of the piston 1 into the cylinder 2 and from the latter throughpressure valve 11 into the cylinder cover 3 and through the connectingpipe 13 (Fig. 3) to the coiled pipe 12 where it is cooled and condensedand is fed back to the evaporatorv through connecting pipe 22 (Fig. l).In order to prevent the vaporized refrigerant from escaping from thecrank case 9, the crank shaft 15 is surrounded by a low-pressure packing(Fig. 2) comprising a stuffing box 14, asbestos cords 16, 17 being achamber lled with a composition of graphite, aluminium powder andglycerine.

The crank shaft 15 is driven from the motor D (Figs. 1 and 2)indirectly. The motor sheave 18 drives by means of a belt 25 arelatively large 80 intermediate sheave 19 formed as a fan. 20 is asmall sheave mounted on the shaft of the intermediate sheave 19; itdrives the large sheave 21 mounted on the crank shaft 15 by means of abelt 26. This drive operates free of noise and S5 permits using aninexpensive small high speed motor for driving the compressor.

I wish it to be understood that I do not desire to be limited to theexact details of construction shown and described for obviousmodications will occur to a person skilled in the art.

A compressor comprising a crank case having its top edge formed with acylindrical groove, a plain tubular cylinder having its bottom edgeseated in said groove, a plain substantially hemispherical cover seatedon the top edge of said cylinder, a piston mounted in said cylinder foraxial reciprocating motion, a horse-shoe strap having its free endsanchored in said crank case and a screw bolt extending across the middleportion of said strap and bearing on said cylinder cover so as to formtogether with said strap the sole coupling means for said crank case,cylinder and cylinder cover.

WILHELM KURT SCHMIDT.

